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Incomprehensible optical device!

That is, I found in the attic.
It is a small device (AA battery for comparison).
At the bottom of the mirror, the eyepiece - one lens ca. 2, 5-fold.
At the end of the "tube" - Matt stele.
What is covered in the "microscope"?





Source:
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...
Backyard Astronomy: an inside look at the community's interests and rakes beginners
...
Dead Road ghost: the tragic story building
...
Interesting facts about minerals and gems
...
The world's first computer
...
How it works: Touchscreen
...
6 "new" gaming innovation
...
As I analyzed the collected-diesel engine
...
Tales of underground tunnels
...
Leica inside. Like going to the camera
...
US Army - the biggest myth of the twentieth century
 Report from the Clinic of Pediatric Neurosurgery (8 photos)  Disarm troops or "Farewell to Arms"